Bull. Natl. Mus. Nat. Sci., Ser. A, 47(2), pp. 55–63, May 21, 2021 DOI: 10.50826/bnmnszool.47.2-55 A New Species of Leptochiton (Mollusca: Polyplacophora) from Shallow Water of the Andaman Sea Hiroshi Saito1* and Mu Mu Aung2 1Department of Zoology, National Museum of Nature and Science, 4–1–1 Amakubo, Tsukuba, Ibaraki 305–0005, Japan 2Forest Research Institute, Forest Department, Ministry of Natural Resources and Environmental Conservation, Yezin, Nay Phi Taw, Myanmar *E-mail:
[email protected] (Received 2 March 2021; accepted 24 March 2021) http://zoobank.org/0244307D-B3D1-4B84-87FB-D4FB04AAA7F8 Abstract A new chiton species, Leptochiton myeikensis n. sp. is described from the southern Myeik (Mergui) Islands, Andaman Sea, Myanmar. This is the fifth species of the genus Leptochi- ton from tropical shallow waters. The new species is distinguishable from other congeners by the sculptures of tegmentum and girdle scales, and shape of the radula teeth. Key words: chiton, Myeik Islands, Myanmar, Indian Ocean, new species, taxonomy. Introduction in 75% ethanol. The valves, girdle scales and spic- ules, and the radula were observed by the scanning The genus Leptochiton has large species rich- electron microscope (SEM) JEOL-LV6380, Jeol ness, including 140 species (Molluscabase) Co., Tokyo. Preparation for the examination by which are distributed in the world seas. However, SEM followed Sirenko (2020) with modification: there is no record of Leptochiton species from girdle elements (hyponotum and perinotum) and the shallow water of the Andaman Sea (Kaas and radula were dried with a critical point dryer JCPD- Van Belle, 1985; 1998; Schwabe, 2006).